1) Remember all data nodes should be healthy to perform this activity, if any disk failure is there, it will throw error like this; ERROR tools.DiskBalancerCLI: java.lang.IllegalArgumentException 2) ERROR tools.DiskBalancerCLI: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.diskbalancer.DiskBalancerException): Disk Balancer is not enabled. add property in HDFS configuration >> dfs.disk.balancer.enabled << under HDFS Service Advanced Configuration Snippet (Safety Valve) for hdfs-site.xml, value = true 3) ERROR tools.DiskBalancerCLI: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Permission denied. login through datanode keytab; cd /var/run/cloudera-scm-agent/process && find . -type f -iname "hdfs.keytab" kinit -k -t ./52821-hdfs-DATANODE/hdfs.keytab -p hdfs/hostname@SOME_REALM.COM
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